Combiitatioit-lock



J. VIZCAINO.

COMBINATION LOCK.

APPLICATION FILED MAR. 22. 191B.

Patented July 15, 1919.

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J." VIZCAINO.

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COMBINATION-LOCK.

Specification of Letters Patent.

Patented July 15, 1919.

Application filed March 22, 1918. Serial 0. 223,884.

To all whom it may concern Be it known that I, Josn V zonmo, a citizen of the United States of Mexico, residing at Calle Hidalgo 779, Guadalajara, J alisco, Mexico, have invented new and useful Improvements in Combination Locks, of which the following is a specification.

My invention relates to combination locks, and has as its object to provide a lock composed of a few simple parts, easily operable, and arranged to permit of ready adjustment to a large number of different combinations.

My invention consists in the construction, combination and arrangement of parts herein illustrated, described and claimed.

In the accompanying drawings I have illustrated a preferred embodiment of my invention, and in these drawings, in which similar reference characters designate corresponding parts in all views,

Figure 1 is a front elevation of a lock with the bolt in protracted position and the Fig. 3 is a plan of one of the plates, partly by in section;

Fig. 4 is a front elevation of one of the plates shown in Fig. 3;

Fig. 5 is a rear elevation, partly in section, of one of the plates shown in Fig. 3; and

Fig. 6 is a perspective View from the rear, part of the casing being cut away.

Referring to these drawings, the casing 1 is adapted to be secured into a door or other object to be locked, and is provided with a sliding bolt 2. Means are provided for throwing'and retracting the bolt 2, which may comprise the handle 3 mounted upon a shaft 4 to which is keyed a toothed wheel 5, the teeth of which are adapted to engage the teeth of a rack 6 formed in the member 2.

Connected with the bolt 2 so as to move with the bolt when the handle 3 is turned is a bolt releasing member such as the member 7, which in the form shown is provided with a rack, or a series of holes, adapted to engage the teeth of the toothed wheel 5. The bolt releasing member 7 is located in the easing so that when the bolt 2 is in locked position, the end of the member 7 rests against the plates 8, which block its movement, and

hold the bolt in protracted position until the combination has been set. In this position, the releasing member 7 is placed by the toothed wheel immediately behind the bolt, as an additional safeguard against the bolt being retracted without the member 7 first being released by setting the combination.

The means for preventing movement of the bolt releasing member7comprise a series of plates 8 of diiferent widths, and arranged in a series with the largest plate on the bottom, and the smallest 011 the top. These plates are mounted in the casing to slide, preferably upon rods 9 to reduce the friction, parallel to the front of the casing, and the plates have their front edges adjacent the front wall of the casing, so that the front edges of the plates lie in a common plane, and the rear partsare in stepped relation. The front of the casing is provided with a seriesof slits 10, and windows 11 corresponding to each slit, and the plates 8 have tabs 12 on their front edges which project through the slits 10 andprovide means by which the plates may be slid in the easing. On the front edge of each plate is a series of numbers adapted to appear in the windows 11 to indicate the position of the plates within the casing.

' Each of these plates has at least one transverse slot 13; and these slots are so disposed that when the plates have been slid to show the proper combination in the windows 11, the slots of all the plates are in line, and the bolt releasing member is free to pass between the slots, when the handle 3 is turned to withdraw the bolt.

As has been stated, the rear portions of the plates 8 are in stepped relation; accordingly the end of the releasing member 7 is provided with surfaces in stepped relation, each adapted to rest against the exposed portion of a plate. In the form illustrated, since the slots of the various plates do not extend completely to the rear, the releasing member 7 is made fork shaped, with prongs 14, each of which prongs rests against the exposed portion of the corresponding plate.

In order that the combination may be readily changed, each plate 8 is provided with a plurality of slots 13, and all of these slots except one in each plate are filled with removable plugs 15, which may be secured in place by means of projections 16, adapted to engage corresponding holes in the plates 8 at one end ofthe slots 13, and screws 17 which secure the other ends of the plugs 15 to the members 8. When it is desired to change the combination, the plug corresponding to the new digit desired is removed, and inserted in the slot corresponding to the digit eliminated from the old combination. The slots 13 may be made long enough so as to accommodate the releasing member after it has passed through the preceding plate or plates.

To operate the lock, the plates 8 are slid laterally by means of the tabs 12 until the numbers appearing in the windows 11 correspond to the combination for the look. This brings the slots of the various plates in line, and, upon turning the handle 3, the lock re leasing member 7 enters the slots 13 and allows the bolt 2 to be withdrawn. Since a portion of the member 7 rests against each plate of the series, the member 7 cannot move and the handle 3 cannot be turned, or the bolt retracted, until each of the plates have been set with their slots opposite the releasing member. There is thus no possi bility of the plates being set progressively by feel; and in a lock having siX plates, each with ten slots as illustrated, there are a million possible combinations.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A combination lock, comprising a sliding bolt, means for actuating said bolt, a plurality of slidable members, a bolt controlling member operatively connected to said means and slidable through said members to release said bolt when the members occupy predetermined positions relatively, said members progressively increasing in width and having openings formed therein at predetermined points, and prongs of progressively increasing lengths formed on said bolt controlling member which are adapted to Work in the openings of said members.

2. A combination lock, comprising a sliding bolt, means for actuating said bolt, a plurality of slidable members, plugs removably fitted within said members to provide openings at predetermined intervals, a bolt controlling member operatively connected to said means, a plurality of prongs of various lengths formed on said member and slidable through the openings in said members.

3'. A. combination lock, comprising a sliding bolt, means for actuating said bolt, a plurality of horizontally disposed slidable members, each of said members being formed with an opening, one wall of which is provided with a plurality of recesses, plugs removably fitted in said recesses to provide openings at predetermined intervals, a bolt controlling member operatively connected to said means, and spaced prongs formed on one end of said bolt controlling member adapted to work in the openings in said members.

In testimony whereof I have signed my name to this specification.

JOSE VIZCAINO.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

